Hope he was in heaven a half an hour before the devil knew he was dead...............................
No, your whiskey cannot go bad in the sense of spoiling due to bacteria or fungus of some sort due to its high alcohol concentration, regardless of temperature! If there was a bacteria that could grow in whiskey, I think we would all be doomed LOL. I have a year and some change to go before I can buy some birthday whiskey, but you could sell me what's left of your bottle and I can guarantee it would still be good! Hope you had a great birthday!